[UMA] Rename the misleadinglingly named "install_date" field in the UMA uploads.


Review URL: https://chromiumcodereview.appspot.com/11344022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@164792 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed